Press.



No. 879,318. I PATENTED FEB. 18, 1908. J. RAPPOLD.

PRESS.

APPLIGATION FILED APRJS, 1906.

2 SHEETS-SHEET l.

No. 879,318. PATENTED FEB. 18, 1908.

J. RAPPOLD.

PRESS.

APPLICATION FILED 41mm, 1900.

2 SHEETS-BHEET 2.

l: ////A7//////////A JOHANN RAPPOLD, OF ALLSOHWIL, NEAR BASEL, SWITZERLAND.

PRESS.

Specification of Letters Patent.

Patented Feb. 18, 1908.

Application filed April 13. 1906. Serial No. 311.519.

To all whom it mag concern:

Be it known that I, J OIIANN RAPPOLD, a citizen of the Swiss Republic, residing at. Allschwil, near Basel, in Switzerland, have invented certain new and useful Improvements in Presses, of which the following is a specification.

The dry press according to this invention with intermittently rotating form table and press-heads mounted on press levers arranged above each other, is arranged in such manner that the dry material to be compressed can first be submitted to a compression by a blow or blows by means of only the press head mounted on the up er press lever, and afterwards, by means of a compressed fluid, to a gradual compression by means of the two press heads together, at least one of them being actuated hydraulically.

A construction of the device according to this invention is illustrated, by way of example, in the accompanying drawing Figure 1 is a side elevation, Fig. 2 a plan, Fig. 3 a vertical section on the line A-B of Fig. 1, Fig. 4 a horizontal section on the line XX of Fig. 3, on a larger scale, Fig. 5 a similar section. on the line Y-Y of Fig. 3, and Fig. 6 a similar section on the line Z-Z of a portion of Fig. 3 both also on an enlarged scale. Fig. 7 is a vertical section of several detail parts of the press connected together, on an enlarged scale and in a somewhat dif ferent, and clearer position than that shown in Figs. 1 to 3.

Over and under the intermittently rotating form table 11, provided with rectangular perforations arranged in a circle, are mounted at two opposite points, two press heads I) b vertically movable in guides. The upper press head is hinged to a one-armed press lever 0. Both the press levers are mounted in a frame f. The form table can be caused intermittently to rotate by means of a grooved disk or cam 6. (Fig. 2)

At the free end of the press lever c is suspended a bracket g, the arms of which are ivoted to a cross beam h attached to the forked head of the piston rod 1' of a piston 1' (Fig. 7) traveling up and down in a vertical press cylinder k. The same press cylinder is contains at'the top a second piston y', to the piston rod 6/ of which is hinged a connecting rod m, the bottom end of which engages with the free end of the bottom press lever c. The press cylinder k is provided at a point between the two pistons 3g" and j with a branch n of ample cross-section. With the said branch communicates a narrow pipe 0 from a forcing pump p. It also has connected to it a stop valve g which, on the other side communicates with a tank 1". ing the piston of the forcing pump p an eccentric on is used (Fig. 2) mounted on a shaft t driven from the driving shaft 8. On the same shaft t is also adjustably mounted a cam a which intermittently acts on a bracket or projection 61 provided on the upper press lever. On the driving shaft .9 is adjustably mounted a cam 12 which intermittently acts on a lever w connected by means of a link .2 and an oscillating part or beam 7 with the spindle of the stop valve q;

The working of the press described is as follows :VVhen the shaft t is rotating the cam it strikes the bracket d and raises it together with the upper press lever. The bottom press lever remains for the moment stationary. After the cam a" has passed the bracket, the press lever c quickly and freely falls down under the influence of its own weight and gives a blow to the material to be compressed, placed in the mold or form arranged under the press head b.v ,At the moment when the upper press lever begins its upward movement, the cam o mounted on the driving shaft 8, strikes the lever w, whereby the valve cone of the stop valve q is lifted off its seat, so that the piston 3" connected to the upper press lever and therefore moving upward with it, can eXpel the water contained in the press cylinder 70, and force it into the tank 1 whence it can again quickly (owing to the large cross-sectional area of the branch n) flow back into the press cylinder is during the subsequent downward movement of the press lever a. After the fall of the press lever c, the piston of the forcing pump p is at once operated by the action of the eccentric :2. At the same moment, the cam 11 ceases to act on the lever w, the stop valve g, the valve cone of which is controlled by a spring, being then closed.

Water under pressure, passing from the force pump p through the pipe 0 into the branch n, and through the latter into the press cylinder 7c, exercises a pressure on the two pistons j and j and they are consequently driven apart. As the bottom piston j is connected to the upper press lever c, and the upper piston j to the bottom press lever c, the ends of the press levers are moved towards each other, so that the material is exposed For driv to a hydraulic pressure. After the pressure in the press cylinder is ceases, the bottom press lever falls down under the influence of its own weight, while the upper press lever is again raised by the cam 11.. During this stroke, the table 0 is slightly turned by the grooved disk or cam a so that a new mold is brought between the press heads I) b.

The press described makes it possible to make up to 1,000 compressions per hour.

The forcing pump could be replaced by a device with a hydraulic accumulator. Instead of water under pressure some other compressed medium, for instance compressed air, could be used for operating the pistons of the press levers.

lVhat I claim as my invention and desire to secure by Letters Patent is 1. Apress comprising a mold table, upper and lower press-heads, arms for supporting said press-heads, means for raising the upper press-head independently of the lower presshead, pistons operated by fluid under pressure, and means connecting the pistons to the press-head arms to force the press-heads towards each other when the pistons are driven outwards substantially as set forth.

2. A press comprising a mold table, upper and lower press heads, arms for supporting said pressheads, a cam for raising the upper press-head independently of the lower presshead, pistons operated by fluid under pressure, and means connecting the pistons to the press-head arms to force the press-heads towards each other when the pistons are driven outwards substantially as set forth.

3. Apress comprising a mold table, upper and lower press-heads, arms for supporting said press-heads, a hydraulic cylinder, two pistons mounted therein, an operative consupply of fluid under pressure to the cylinder L and means for intermittently relieving the pressure in the cylinder simultaneously with the raising of the upper press-head substantially as described.

5. In a press of the kind described a rotary mold table, upper and lower pressheads, arms carrying said press-heads, a hydraulic cylinder, a valve therefor, pistons movable in said cylinder, operative connections between the upper piston and the lower presshead arm, operative connections between the lower piston and the upper press-head arm, a cam for raising the upper press-head arm, a cam for operating the cylinder valve, a cam for operating the cylinder pump and gearing for intermittently rotating the table and operating the said cams, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHANN RAPPOLD.

Witnesses:

JOHANNA ZIEGLER, GEO. GIFFORD. 

